Engineering Materials Practice Set-8

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1. An example of amorphous material is

Zinc

Glass

Lead

Silver

2. Nimonic contains __________ percentage of nickel as that of Inconel.

None of these

Less

Same

More

3. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Nickel and molybdenum

Aluminium and zinc

Chromium and nickel

4. Manganese in steel increases its

Tensile strength

Hardness

Ductility

Fluidity

5. Which is false statement about tempering? Tempering is done to

Improve machinability

Improve ductility

Improve toughness

Release stresses

6. Compressive strength of grey cast iron in tonnes/cm is of the order of

35

710

57

1015

7. The presence of sulphur in pig iron makes

It brittle

The casting unsound

It easily machinable

It hard

8. High carbon steel carries carbon percentage

0.8 to 1.5%

0.3 to 0.6%

0.1 to 0.3%

0.6 to 0.8%

9. Which of the following is the binding material in cemented carbides?

Cobalt

Nickel

Iron

Vanadium

10. Beryllium bronze has

(C) Both (A) and (B)

(A) High yield point

(B) High fatigue limit

(D) None of these

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11. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and zinc

Nickel, copper and iron

Copper, nickel and antimony

12. Argentite is the principal ore or raw material for

Tin

Zinc

Aluminium

Silver

13. Tungsten in high speed steel provides

Hot hardness

Toughness

Wear resistance

Sharp cutting edge

14. The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

Can be drawn into wires

15. The machinability of steel is increased by

Silicon and sulphur

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

16. Weld decay is the phenomenon found with

Mild steel

Nonferrous materials

Stainless steel

Cast iron

17. Steel made from phosphate iron is

Ductile

Brittle

Tough

Hard

18. Hardness of upper bainite (acicular structure) is about

RC 57

RC 48

RC 65

RC 80

19. Free cutting steels

Require least cutting force

Contain carbon in free form

Do not exist

Are used where ease in machining is the criterion

20. Melting point of iron is

1712°C

1601°C

1489°C

1539°C

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21. Bronze contains

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

22. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.6 to 0.7%

0.1 to 0.2%

0.25 to 0.5%

23. Permalloy is a

Kind of stainless steel

None ferrous alloy

Polymer

Nickel and iron alloy having high permeability

24. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

Iron, nickel and copper

25. Cold rolled steel sheets contain carbon of the following order

0.4%

0.6%

0.2%

0.1%

26. Which of the following is used for bearing liner?

Gun metal

Bell metal

Babbitt metal

Bronze

27. Phosphor bronze contains

None of the above

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

28. The alloy used for making electrical resistances and heating elements is

Magnin

Elinvar

Invar

Nichrome

29. The hardness of steel increases if it contains

Cementite

Austenite

Martensite

Pearlite

30. Preheating is essential in welding

All nonferrous materials

Cast iron

All of the above

High speed steel

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31. Sulphur in cast iron

Aids fusibility and fluidity

Make the iron white and hard

Increases hardness and brittleness

Makes the iron soft and easily machinable

32. Aluminium bronze contains aluminium and copper in the ratio of

10 : 90

60 : 40

50 : 50

40 : 60

33. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Manganese

Chromium

Nickel

34. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

B.C.C.

H.C.P.

35. Cupola produces following material

Wrought iron

Cast iron

Malleable iron

Pig iron

36. Shock resisting steels should have

Toughness

Low hardness

Low tensile strength

Low wear resistance

37. Carbon in iron is an example of

All of the above

Intermetallic compounds

Substitutional solution

Interstitial solid solution

38. Chromium in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves cutting ability and reduces hardenability

39. Gun metal contains

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70 - 78% copper and rest tin

40. Connecting rod is usually made of

High carbon steel

Aluminium

Medium carbon steel

Low carbon steel

Engineering Materials Practice Set-8

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